/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package com.swak.netty.echo;

import com.swak.utils.Fmt;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;

/**
 * Sends one message when a connection is open and echoes back any received
 * data to the server.  Simply put, the echo client initiates the ping-pong
 * traffic between the echo client and server by sending the first message to
 * the server.
 */
public final class EchoClient {

	static final boolean SSL = System.getProperty("ssl") != null;
	static final String HOST = System.getProperty("host", "127.0.0.1");
	static final int PORT = Integer.parseInt(System.getProperty("port", "8007"));
	static final int SIZE = Integer.parseInt(System.getProperty("size", "256"));

	public static void main(String[] args) throws Exception {
		// Configure SSL.git
		final SslContext sslCtx;
		if (SSL) {
			sslCtx = SslContextBuilder.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();
		} else {
			sslCtx = null;
		}

		// Configure the client.
		EventLoopGroup group = new NioEventLoopGroup();
		try {
			Bootstrap b = new Bootstrap();
			b.group(group).channel(NioSocketChannel.class).option(ChannelOption.TCP_NODELAY, true)
					.handler(new ChannelInitializer<SocketChannel>() {
						@Override
						public void initChannel(SocketChannel ch) throws Exception {
							ChannelPipeline p = ch.pipeline();
							if (sslCtx != null) {
								p.addLast(sslCtx.newHandler(ch.alloc(), HOST, PORT));
							}
							// p.addLast(new LoggingHandler(LogLevel.INFO));
							p.addLast(new EchoClientHandler());
							p.addLast(new Handler());
						}
					});

			// Start the client.
			ChannelFuture f = b.connect(HOST, PORT).sync();

			// 发送数据
			try {
				ChannelFuture future = f.channel().writeAndFlush("123");
				boolean success = future.await(10000);

				// 这里会产生什么异常
				Throwable cause = future.cause();

				// 写超时 - 需要抛出异常
				if (!success || cause != null) {
					Fmt.out.println("写超时 ：" + future.isDone());
				}
			} catch (Throwable e) {
				Fmt.out.println("发送异常 ：" + e);
			}

			// Wait until the connection is closed.
			f.channel().closeFuture().sync();
		} finally {
			// Shut down the event loop to terminate all threads.
			group.shutdownGracefully();
		}
	}
}
